Roseville Police say a former teacher arrested on child pornography charges may have other victims from his past -- including students.

Robert Alan Kill was first arrested in October, accused of producing and possessing child pornography.

"As our detectives continued to investigate, they found some evidence that he may have recorded other underage girls," Dee Dee Gunther with the Roseville Police Department said. 

Gunther says Kill was a teacher with the San Juan Unified School District from 1979 until he retired in 2011.

"We are concerned that there are more victims out there," she said.